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hummm you set the throttle break neutral?? do you have a spare Rx & radio to try?

Speed Control Programming Instructions

The Castle Creations Mamba Max speed control should not need
reprogramming with normal use. However, if you install a different
radio system in your model, or change the transmitter’s throttle-neutral
setting from 50/50 to 70/30, you will need to reprogram the speed
control. Follow these instructions to reprogram the speed control:
1. Install the batteries of your choice in the battery compartments and
plug the batteries into the speed control.
2. Switch on your transmitter.
3. Hold full throttle while you switch on the Mamba Monster controller.
After a few seconds, you will hear multiple tones and the
RED LED will light.
4. Hold full brake. After a few seconds, you will hear multiple tones
and the YELLOW LED will light.
5. Release the trigger to the neutral position. After a few seconds,
you will hear multiple tones and ALL THE LEDs will light.

Something is still wrong. It started accelerating on its own again and the "ready" beeps are taking about 20 seconds to sound. I think I just need to try replacing the receiver and/or transmitter. My motor also got very hot - might be because I had to keep the brakes on most of the time.

You know I didn't even check. I'll look for it next time. The reason I keep pointing to a faulty receiver/transmitter is because when it accelerates on its own, I can stop the car by turning the transmitter off. Got new Tx/Rx on the way, so we'll see.

I forgot to mention, my batteries were also very hot, not just the motor.